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Share-Based Compensation - Schedule of Shares Purchased by Employees Under Employee Stock Purchase Programs (Details) (Predecessor [Member], Employee Stock Purchase Program [Member])
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 28, 2012
Predecessor [Member] | Employee Stock Purchase Program [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares purchased by employees 5us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesPurchasedForAward
/ us-gaap_PlanNameAxis
= prx_EmployeeStockPurchaseProgramMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember